arm64: dts: ti: k3-j721s2-som-p0: add bootph-pre-ram property to PMIC-B

arm64: dts: ti: k3-j721s2-som-p0: add bootph-pre-ram property to PMIC-B

On j721s2, PMIC-B is needed to exit the DDR from retention after
suspend-to-ram. Add bootph-pre-ram property to make PMIC-B available to
the bootloader in the phase that sets up the DDR.

Signed-off-by: Thomas Richard (TI) <thomas.richard@bootlin.com>
Reviewed-by: Udit Kumar <u-kumar1@ti.com>
Link: https://patch.msgid.link/20260429-k3-j721s2-som-bootph-pre-ram-pmic-4c-v2-1-31a0e7677216@bootlin.com
Signed-off-by: Nishanth Menon <nm@ti.com>